Anesthetic apparatus.



A C. CLARK. ANESTHETIC APPARATUS.

PLICATION FILED ,1 l3. 1,167,85. Patented Jan. 4, 1916.

MB PLANOGRAPH c0.. WASHINGTON D c nnrrnn FaTATEE Parisian ohm-on.

ALBERT CHARLES CLARK, OF CHICAGO, ILLINOIS, ASSIGNQR- A. C. CLARK & COMPANY, OF CHICAGO, ILLINOIS, A CORPORATIGIN OE ILLII (31S.

ANESTIIETIG AEPAB-ATUS.

Application filed April 19, 1913.

T all whom it may concern Beit known that I, ALBERT C. CLARK, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Anesthetic Apparatus, of which the following is a specification.

My invention relates to anesthetic apparatus of that type or character capable of administering different kinds of gases such as nitrous oxid and oxygen, the apparatus being capable of administering such gases either separately or mixed.

The object of my invention is to provide an apparatus of this character which shall have means for readily indicating to the operator at a glance the particular kind of gas or the degree of mixture thereof with the other gases according to the position of the operating handle, such indication being a visual one and in general comprising con trasting colors such as black to indicate nitrous oxid and red, the oxygen.

In the drawings Figure l is a perspective of my gas apparatus but with the usual gas cylinders and bags removed; Fig. 2, a top plan view of a portion of the same, but with the operating handle stem in section; and Fig. 3, a portion of the top face of the valve on a larger scale.

Referring to the structure illustrated in the drawings the apparatus comprises a central post 1 supported by the legs 2 and surmounted by a valve casing 8 within which the valve mechanism (not shown), for governing the supply and mixture of the gases through the outlet 4 is located. It will be understood that the usual gas cylinders are secured to the arms by being clamped and held within the openings 5 thereof, the gas passing through the arms and through gas bags (not shown) which are secured to the fixtures 6 in a manner which need not be here set out, but which is fully described in applicants pending application filed March 26,1912, Serial No. 686,252.

It will be sutlicient to state as above that the valve mechanism which here comprises a single valve operated by a handle 7 and a 1 stem 8 controls the supply of either gas separate or both gases mixed.

The top face of the valve casing is graduated but instead of having these graduations or marks appear entirely upon the face itself of the casing I prefer to provide there- Specifieation of Letters Patent.

Serial No. 762,345.

upon a raised portion or a substantially semicircular plate 9 on which appear such graduations whereby in connection with the pointer 10 forming a part of the stem 8 the different positions of the valve may be accurately determined. In the present instance these graduations consist of two oli indications at opposite sides of the valve casing to indicate the two closed positions of the valve, a N 0 indication to indicate a position of the valve for the admission of the nitrous oxid and an oxy indication to indicate the position for the admission of oxygen alone and between the two last mentioned indications a series of marks or gradnations for the purpose of indicating the position of the valve to obtain a mixture of the two gases in different proportions according to its particular position.

As shown in Figs. 1, 2 and 3 the top of the casing is provided with different and contrasting colors, onehalf being in the present instance colored black and the other half red, and the plate 9 is provided with crescent shaped overlapping markings or surfaces of black and red arranged to indicate visually the proportions of nitrous oxid and oxygen being used. The black corresponds to the nitrous oxid side of the casing that is that side occupied by the indicator 10 when nitrous oxid is being supplied by the valve mechanism alone or in hi her percentage as compared with the oxygen, The red is on that side of the casing corresponding to the oxygen side that is the side occupied by the indicator or pointer 10 when oxygen is be ing supplied alone or in a higher percentage as compared with nitrous oxid.

The black marking upon the plate 9 hegins at an off position, at the inner edge thereof, and extends in crescent form over the plate and disappears atthe graduation 11 which indicates the position for the ad mission of oxygen alone. This crescent increases in size from the said off position or indication, reaching maximum between the graduations 12 and 13 representing the position for the admission of nitrous oxid alone. The crescent then decreases acros. the medial line 1% and ends at the inner end of the graduation 11. In like manner a similar crescent but colored red starts at the other off indication and after increasing to full size between the graduations 15 and 11 disappears at the outer end of the gradnation 13, overlapping the other crescent The between the oraduations 11 and 13.

1 ZlCilTllSSlOIl or oxygen begins when the pointer oi the valve handle is at 13 position and the amount admitted increases as 1nd1- cated by the size oi the crescent, oxygen alone in full quantity being admitted hetwe'en the graduations 11 and 15 and the amount decreasing from thence to the 01" position or graduation. ts a result oi tns construction and use of contrasting colors the operator can see at a glance Wheti'icr he 12; administering nitrous oxid or oxygen and the relatrve oro )Ol'tlOIlS or both in case or a mixture, without the necessity ot tah the pains to accurately o )SGl'VG the partic. lar position oi the poiter 10 with relation to the calibrated plate. li hen this pointer is covering the hlacl: side of the casing the operator knows that nitrous oxic is being administered either alone or in excess oi the oxygen and likewise when the pointer is over the red side of the casing, he lrnovvs that either en alone or an excess of the oxygen is llGil A administered. Also by the we of the colored C1'G."Glltf1i, the operator is visually informed of e exact proportions of the mixture of the two accordimr to th p' ition of the valve handle point r. e, when such pointer is at grad nation ll, Where the cresccnts are of equal dth, it is visually indicated that the two gases are being admitted and mixed in equal proportions.

By preference the top surface of the valve casing and the plate 9 are enameled with the exception of the substantially half crescent portions 9 at opposite ends of the plate, which portions are preferably left plain, in practice being nickel plated, thereby affording a sharp contrast with the two colored crcscents as indicated in Figs. 1 and 2.

.Vhile I have described the indicator as a separate element (the pointer 10 carried by the stem 8) it is obvious that it is only necessary that some part of the handle structure-for instance the handle itsel:t shall cooperate with the graduations upon the plate 9 in order to afford an indication of the position of the mixing valve.

I claim:

1. In an anesthetic apparatus, a valve. device arranged to supply tvvo diiierent gases from different sources either alone or mixed in different proportions and including a valve handle and fixed and movable Copies of this patent may be obtained for five cents each,

indicating elements, one of said elements being provided With complementary contrasting colored areas constituting scales for in dicating at a glance the particular gas being supplied or the relative proportions of such gases;

ln an anesthetic apparatus, a valve device arranged to supply two different gases from dilierent sources either alone or mixed in dii'lerent proportions and including a valve handle arran 'ed for indication, and a casing having indicated thereon in contrasting colors 'tWG crescent-s overlapping each other.

in an anesthetic apparatus, a valre device arranged to supply nitrous oxid and oxygen either alone or mixed in different proportions and including a valve handle arranged for indication and a casing colored on one-half to indicate the nitrous oxid side thereof and colored by a contrasting color on the other half to indicate the oxygen side thereof, saidcasing having at its margin overlapping crescents in contrasting colors.

l. in an anesthetic apparatus, a valve gases from diil'erent sources either alone or mixed in dillerent proportions and including a valve handle arranged for indication, and a casing provided with an upwardly projecting portion having indicated thereon in contrasting colors two overlapping cresccnts at its intermediate portion to indicate mixture of the two gases and substantially half crescents in still. different cont asting color at its end portions.

In an anesthetic apparatus, a valve device arranged to supply nitrous oxid and oxygen either alone or mixed in different proportions and including a valve handle arran d for iinlication,and a casing colored black on one half to indicate the nitrous oxid side thereof and colored red on the other hall to indicate the oxygen side there oi. casing being provided with a plate 9 having graduations to indicate oil positions 01 the valve. device, .N O and oxy positions thereof and also having indicated thereon in contrasting colors tvvo overlapping crescents to indicate mixture of the tvvo gas ALBERT CHARLES CLARK.

llitnesses S. E. l-lrnnnn, ROBERT DOBBERMAN.

by addressing the Commissioner of Patents.

Washington, D. G.

'1 0 arranged to supply two different. 

